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A 5Cr-1Mo piping system in the hydrogen unit shows significant internal wall loss after 2 years in service due to CO corrosion. Which material would be best suited to use to install a new pipe system?
Suggested Answer: D
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29 comments · newest first
LA
Laticia
7 months ago
I agree, 9Cr-1Mo seems like the best option overall.
OL
Olen
8 months ago
9Cr-1Mo has proven performance in similar conditions.
RO
Rodney
8 months ago
316 SS could work, but not ideal for CO corrosion.
EU
Eulah
8 months ago
A-106 Gr B might not hold up well in hydrogen.
AM
Ammie
8 months ago
Definitely not titanium; too expensive for this application.
LA
Lavera
8 months ago
Surprised 5Cr-1Mo failed so fast, thought it was more durable!
TE
Telma
8 months ago
A-106 Gr B? Really? That seems risky with CO corrosion.
BO
Boris
9 months ago
9Cr-1Mo is a solid choice for high temp and corrosion resistance.
WI
Wilbert
9 months ago
Hmm, I wonder if they have a "Vibranium" option. That would be the ultimate corrosion-resistant material, right? (Just kidding, of course.)
JE
Jeannetta
9 months ago
Titanium? Really? That's overkill and way too expensive for a piping system. Let's keep it practical, folks.
AM
Amber
9 months ago
316 SS is always a solid choice, but I'm not sure it's the most cost-effective solution for this particular application.
DE
Devorah
9 months ago
I think 9Cr-1Mo would be the best choice here. It's got good corrosion resistance and can handle the hydrogen environment.
BE
Bernardine
9 months ago
I think I'd go with 316 SS. It's a common material for corrosive services and should provide good resistance to the CO corrosion. The other options seem a bit more specialized.
DE
Desmond
10 months ago
Titanium is too expensive for this application.
OL
Olga
10 months ago
I think 9Cr-1Mo is a solid choice. Better corrosion resistance.
TA
Tamar
10 months ago
I think 316 SS would hold up better in hydrogen environments.
JE
Jesse
10 months ago
A-106 Gr B might be a cheaper option, but I'm not sure it would hold up as well in this kind of corrosive environment.
IR
Irma
10 months ago
I'm a bit confused on the differences between 9Cr-1Mo and A-106 Gr B. Can someone help me understand which one would be more suitable for this application?
DU
Dudley
11 months ago
Okay, I've got this. Titanium would be the best choice - it has excellent corrosion resistance, even in harsh environments like this. The other options just won't hold up as well.
TR
Trinidad
11 months ago
Hmm, I'm not too familiar with the specifics of these materials. I'll need to review my notes on corrosion resistance and hydrogen service to make an informed decision.
AZ
Azalee
11 months ago
This seems like a tricky corrosion question. I'd need to think carefully about the properties of each material and how they might perform in a hydrogen environment with CO corrosion.
CH
Chau
6 months ago
Titanium is great too, but is it cost-effective for piping?
AL
Alexia
6 months ago
But what about 316 SS? It’s known for its corrosion resistance.
JA
Janey
7 months ago
True, it has better resistance to CO corrosion.
PA
Paris
7 months ago
I think 9Cr-1Mo could be a good choice.
ST
Stephania
11 months ago
I think titanium is great for corrosion resistance, but it might be overkill and too expensive for this application. I lean towards 9Cr-1Mo based on what we practiced.
WE
Werner
12 months ago
I’m a bit uncertain about A-106 Gr B; I know it’s common for high-pressure systems, but I don’t recall its performance against CO corrosion specifically.
JA
Jaime
12 months ago
I feel like we did a similar question in class about material selection for corrosive environments. I think 9Cr-1Mo might be a better option because of its higher temperature strength.
TA
Tamra
12 months ago
I remember studying corrosion resistance, and I think 316 SS is good for acidic environments, but I'm not sure if it's the best choice for high temperatures.